I have configured DSL internet connection in openSUSE 12.1.
The network is working, but I can't modify the connection's
properties as the DSL devices window in YaST is empty, that is
it does not show the configured device(s). The providers window
shows the configured providers normally.
I would like to change the connection mode of the DSL device but
I can't since there is nothing to select in the devices window.
This works well in my openSUSE 11.2 system.
Is this a bug in oS 12.1 or am I missing something?
Is there a fix?

If you've also installed the latest 12.1 updates, it sounds like a bug.

I started network config again from zero.
The network card could be configured normally.

Here I the steps of DSL/ADSL device configuration, started from
no device configured.

Since the DSL devices window is empty, I cannot configure/change
how device should connect to the net (at boot, on hotplug, manually).
Even if I configure it as "at boot" I have to connect manually
after logging in. I want the machine to connect to the net
automatically at boot. For example if I restart it from another
computer I want to be able to connect to it again.